To apply for an exemption, fill out the 2024 Loudoun County Tax Relief Application (PDF) and submit the supporting documents. Each year applicants must complete and file Form PTAX-340 with the Chief County Assessment Officer.General Homestead Exemption Requires an initial application, rentals need annual renewal. There is no annual renewal for this exemption. Applicants will need to provide proof of age (ex. You may be eligible for real property tax relief in most Virginia cities and counties if you are 65 years old or have a disability (regardless of age). You are 65 years of age or older as of January 1 in the year you file for the exemption. This exemption is automatically applied to your property if it is a new purchase.